Improvement in latches for coach-doors



1. THIELEMANN. -Latches for Coach Duurs-.

JNO/139,485. V hmmum@@@1373y` a UO was as ,4M PHaroi/maG/FAPH/c co.mmswmvs's mams) UNITED STATES JOHN THIELEMANN, OF NE WARE, NEW JERSEY.

IMPRQVEMIENT IN LATCHES FOR COACH-DOORS.

Specification forming part of Letters Patent No. 139,485, dated June 3,1873; application led March 8, 1873. i

To all whom it may concern:

Be it known that I, JOHN THIELEMANN, of Newark, in the county of Essexand State of New Jersey, have invented certain Improvements inCoach-Door Locks, of which the following is a specification Thisinvention relates to that class of locks or spring-latches, known ascoach-door locks. The object of this invention is to provide a lock orlatch that can be opened with great facility from the inside of' thecoach, by smply pushing or pulling in one direction the handle of alever on the inner side of acoachdoor.

In the drawing forming part of this specilication, Figure l shows theinterior mechanism ot' lthe lock oi' latch. Fig. 2 is a section of thesame on the line x w of Fig. l.

In these figures, B and C are two bent levers jonrnaled upon studs a a2on the inner side of the lock-plate A. These levers form olle compoundlever l'or the purpose ot' withdrawing the lock-bolt or latch E from themortise in the door-frame of the coach. The arm F of the outside handle,which aotuates the bolt E, throws it back without in any manneractuating the lever O. The levers B and C perform the function of acompound lever only -in retracting the lock-bolt E by moving the handleof the lever G on the inside of the coach, and have no other relation toeach other for any other purpose.

A convenient method of securing the bolt E to the lock-plate A is shownin the drawing, but which method, briefly described in the nextparagraph, is not claimed as forming any `part of this invention. Aspring of any ordinary construction presses against the heel of the boltE, which bolt by means ofthe pin i therein near its heel, is guided by aslot in the lock-plate A in which the pin i slides; this pin issecuredinthe slotbya nuton itsend.

The pressure of this spring upon the bolt E causes it to spring into themortis@` of the dor-frame whenever the door is closed.

One great advantage or" llns lock or latch is its great simplicity. Thecombination of the levers B and C, forming one compound lever, and theposition ofthe lever C, wherebyl it can be made without inconvenienceot' cony the bolt E without strain or pain upon the f hand or fingers;the absence of such leverage in locks heretofore made frequently causes.not only such pain, but otten a total failure to open the lock insudden emergency.

As my invention, I claim- In a coach-door lock or latch, the bentleversB and G,journaled upon separate pins a a2, and forming, by the` contactof their short arms, one compound lever, in combination y with thelock-bolt E, whereby the said bolt E is retracted in the mannersubstantially as described, for the purposes set forth.

JOHN THIELEMANN. Witnesses:

OLIVER DRAKE, DAVID COLLINS.

